Jaime Bozza a écrit :
The additional information I have (over the PR) is that:
1) Files over 64K cause the problem, not just larger files
I thought it was over 1 MB or so. But maybe I'm wrong. ISTR that I
couldn't trigger it with some images of around 70K.
I discovered it originally with a 72K file. After some tests, I found a 63K
file worked and a 65K file didn't. When I get back into the office, I can test
the actual boundary (65535, 65536, 65537, etc), but 64K seems pretty logical.
2) switching over to SCHED_4BSD eliminates the problem - system no
longer locks.
I will have to test this. This is indeed interesting...
3) 7.2 amd64 doesn't have the problem - Tested a similar
configuration and was not able to duplicate on amd64 at all.
I can replicate this problem on FreeBSD 7.2/amd64 reliably.
I haven't tried larger files - Maybe the boundary is different on amd64?
Doing some quick tests right now, I was able to upload a 100MB file without a
problem, but this is an AMD64 system with SMP, plus the filesystem is all ZFS,
so there are too many things different. I'll have to setup a system that
closely mirrors the rest of my tests (UFS, ULE, no SMP, etc) before I can say
I'm not having a problem there.
Jaime
I had the same issue using 7.1 amd64, with ZFS, no SMP.
Not really sure what is the size boundary. I can't really test either,
as the machine is remote.
But I confirm that each tentative upload of certain relatively 'big'
files (around 1MB) with wordpress hanged the system before I switched
from sendfile to writev.
I might do some test on amd64 7.2 with no SMP if it can be of any use ?
Arnaud
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